Dear Irene, The Big Ol' Bouncer comes with the 680 watt blower for 12 x 12 support, so that's the one you'll want for a replacement. You can find that blower for sale on our website here: http://www.blastzone.com/680w-blower-for-residential-bounce-houses-up-to-12x12 I hope that helps! Sincerely, Blast Zone Support